Advertisements
Advertisements
Question
The atomic number of an element is 9, it has 10 neutrons. Find the element from the periodic table. What will be its mass number?
Advertisements
Solution
The element is Fluorine
Its mass number A
= n + p
= 10 + 9 = 19
∴Mass number of Fluorine = 19
APPEARS IN
RELATED QUESTIONS
Complete the following table.
| Atomic number | Mass number | Number of Neutrons | Number of protons | Number of electrons | Name of the Atomic species |
| 9 | - | 10 | - | - | - |
| 16 | 32 | - | - | - | Sulphur |
| - | 24 | - | 12 | - | - |
| - | 2 | - | 1 | - | - |
| - | 1 | 0 | 1 | 0 | - |
What is variable valency? Name two elements having variable valency and state their valencies.
The number of electrons in the atom of an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of an atom of this element ?
The properties of the elements are a periodic function of their __________.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Lithium [At. no. = 3, Mass no. = 7]
The Atomic number of an element is 20. It has ______ valence electrons.
Match the following:
| Column A | Column B | ||
| 1. | K shell | a. | 8 |
| 2. | L shell | b. | 32 |
| 3. | M shell | c. | 2 |
| 4. | N shell | d. | 18 |
If element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
If M is the atomic mass and A is the mass number, then packing fraction is given by ______.
Element ‘P' has electronic configuration 2,8,8,1. The number of chlorine atoms present in the chloride of ‘P’ is ______.
